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I read that ballet superstar MIKHAIL BARYSHNIKOV owns a plantation in Florida. Where?

Baryshnikov's dance company, the White Oak Dance Project, is named after the White Oak plantation near Jacksonville and has its studios there. But he doesn't own the plantation, which was the property of wealthy industrialist Howard Gilman until his death last year. Gilman was instrumental in helping Baryshnikov launch his new company af-ter the superstar was ousted as director of the American Ballet Theatre in 1989 for being "too modern." Baryshnikov, 50, recently embarked on one of the most unusual projects of his career. Called "Heartbeat: MB," it features a sequence where he dances to the beat of his heart, which is amplified by a device attached to his chest.

Information, please, on ALLY WALKER, who stars as a forensics expert in the Profiler series.

For Walker, 37, playing Dr. Samantha Waters comes naturally. The daughter of a nuclear scientist, she majored in chemistry and biology, then began a career in genetic engineering. In 1988 a producer spotted her in a restaurant and, struck by her blond beauty, offered her a small part in a beach movie, Aloha Summer. Walker's performance ended on the cutting-room floor, but that same year she became a regular on the NBC soap Santa Barbara, which led to roles in Moon Over Miami and Profiler. Last year, she married NBC vice president John Landgraf, and has a 6-month-old son, John Jr.

Please settle an argument. Has MARY TYLER MOORE had a facelift?

Yes. "If surgery can keep my face up where it belongs, that's okay with me," says Moore, 60. Of more direct concern to the actress are problems arising from her 30-year battle with diabetes. Last year she underwent laser surgery to cure an attack of retinopathy, which can cause blindness if not corrected, and she is now taking medication for her kidneys. "About 30 percent of people on dialysis are diabetics," she says. "I'm taking all the necessary precautions."

DAVID ARQUETTE gives a great comedy performance in the Scream movies. Is he related to Rosanna and Patricia Arquette?

He's their younger brother, one of the five children of actor Lewis Arquette, who also appeared in Scream 2. David was born in a "weird religious commune in Virginia," but later moved with his family to Los Angeles, where Rosanna and Patricia quickly found fame. David says he went through a wild-child period when he began stealing things, writing graffiti and getting tattooed. Then came two TV series, The Outsiders and Parenthood, and several movies. Still unmarried at 25, he had a turbulent relationship with 41-year-actress Ellen Barkin, and is rumored to be dating his Scream co-star Courteney Cox.

Has JACQUELINE BISSET quit the U.S.? I've noticed she's been appearing in French films.

Like many aging actresses, 53-year-old Bissets star has faded in Hollywood, and she now spends much of her time in Europe, a continent the half-British, half-French actress knows well. Last year, she starred in a French thriller, La Ceremonie, then moved to Italy for Dangerous Beauty, an erotic drama in which she plays a mother who sells her daughter into prostitution. Spending time on the Continent has paid off for the never-married actress: After highly publicized romances with French-Canadian actor Michael Sarrazin and Russian ballet star Alexander Godunov, Bisset now has a rekindled career and a new French boyfriend.

For a 15-year-old, LEANN RIMES certainly has a fabulous voice. But doesnt she have to go to school?

The singing sensation puts in three hours of study a day with a personal tutor who goes on tour with her. Rimes says she would like to attend college to study speech pathology, in case her singing career goes sour, but it seems unlikely she will need such backup. Since the release of her first album, Blue, recorded when she was 13, she has sold more than 10 million albums, conceived and starred in her own TV-movie and completed the first of three novels she is writing for Doubleday. Born in Flowood, Miss., Rimes recently bought a magnificent new home in Dallas.

It was interesting to see MARIEL HEMINGWAY in Woody Allen's Deconstructing Harry nearly 20 years after she co-starred with him in Manhattan. Given the disastrous lives of the Hemingways, how come this member of the family is so level-headed?

No one seems to know, including Mariel herself. Five of her relatives - great-grandfather Clarence, grandfather Ernest, Ernest's brother Leicester and sister Ursula, and Mariel's own sister Margaux - committed suicide, and her other sister Joan, known as Muffet, has a history of emotional problems. Mariel thinks that keeping busy may have helped her avoid the Hemingway hex. As well as a booming movie career - she has roles in five upcoming films - she runs a yoga and ballet school in her hometown of Ketchum, Idaho, and will shortly direct a version of her grandfather's best seller, A Moveable Feast, for A&E.;